An optical disc manufacturing method suppresses thickness variation in intermediate layers disposed between any two data recording layers to achieve an intermediate layer of uniform thickness. A substrate having a center hole and data recording layer is first prepared. This center hole is then plugged with a capping member and a resin material is dripped from above the center hole while spinning the substrate around its center hole to coat the data recording layer with the resin by a spin coating method. The capping member is then removed. Then, a stamper having a groove or lands and pits on its surface is prepared. The groove or lands and pits side of the stamper is then pressed into the resin material on the substrate, and the resin is then cured to form an intermediate layer. The stamper is then separated from the substrate to leave a data recording layer in the surface of the intermediate layer with a groove or land-and-pit pattern corresponding to the groove or lands and pits in the stamper.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A manufacturing method for an optical data recording medium, said method comprising: preparing a first substrate; applying a first radiation curable resin to a side of the first substrate; curing a first part of the first radiation curable resin such that a second part of the first radiation curable resin is uncured; preparing a second substrate having a groove or lands and pits on one side; applying a second radiation curable resin to the side of the second substrate having the groove or the lands and pits; curing a first part of the second radiation curable resin such that a second part of the second radiation curable resin is uncured; laminating the first radiation curable resin of the first substrate and the second radiation curable resin of the second substrate together after both of the first and second radiation curable resins are partially cured in said curing of the first part of the first radiation curable resin and said curing of the first part of the second radiation curable resin; curing the uncured second part of the first radiation curable resin and the uncured second part of the second radiation curable resin after the first radiation curable resin of the first substrate and the second radiation curable resin of the second substrate are laminated together in said laminating of the first radiation curable resin of the first substrate and the second radiation curable resin second substrate together; and removing the first substrate after the uncured second part of the first radiation curable resin and the uncured second part of the second radiation curable resin are cured in said curing of the uncured second part of the first radiation curable resin and the uncured second part of the second radiation curable resin.
2. A manufacturing method for an optical data recording medium according to claim 1 , wherein said curing of the first part of the first radiation curable resin includes changing the cured state of the first radiation curable resin inside and outside a first radius of the first substrate.
3. A manufacturing method for an optical data recording medium according to claim 1 , wherein a material used for the first radiation curable resin is different from a material used for the second radiation curable resin.
4. A manufacturing method for an optical data recording medium according to claim 1 , wherein at least one of the first and second substrates is substantially transparent to radiation for curing at least one of the first and second radiation curable resins.
5. A manufacturing method for an optical data recording medium according to claim 1 , wherein the second substrate has one or more recording layers.
6. A manufacturing method for an optical data recording medium according to claim 1 , further comprising, after said removing of the first substrate, forming a recording layer over the second substrate.
7. A manufacturing method for an optical data recording medium according to claim 6 , further comprising forming a transparent layer on the recording layer.
8. A manufacturing method for an optical data recording medium according to claim 1 , further comprising, after said curing of the first part of the first radiation curable resin, removing all or part of the uncured second part of the first radiation curable resin applied outside of a first radius of the first substrate.
9. A manufacturing method for an optical data recording medium according to claim 1 , wherein said applying of the first radiation curable resin to the side of the first substrate comprises applying the first radiation curable resin to the side of the first substrate by a spin coating method.
10. A manufacturing method for an optical data recording medium according to claim 9 , wherein said applying of the first radiation curable resin to the side of the first substrate comprises: closing a center hole of the first substrate with a capping member; and coating the first radiation curable resin over the first substrate by dripping the first radiation curable resin from substantially above the center hole while spinning the first substrate centered on the center hole.
11. A manufacturing method for an optical data recording medium according to claim 1 , wherein said applying of the second radiation curable resin to the side of the second radiation curable resin comprises applying the second radiation curable resin over a recording layer of the second substrate by a spin coating method.
12. A manufacturing method for an optical data recording medium according to claim 11 , wherein said applying of the second radiation curable resin over the second substrate comprises: closing a center hole of the second substrate with a capping member; and coating the second radiation curable resin over the second substrate by dripping the second radiation curable resin from substantially above the center hole while spinning the second substrate centered on the center hole.
13. A manufacturing method for an optical data recording medium according to claim 2 , wherein said curing of the first part of the second radiation curable resin includes changing the cured state of the second radiation curable resin inside and outside a second radius of the second substrate.
14. A manufacturing method for an optical data recording medium according to claim 13 , wherein said curing of the first part of the second radiation curable resin includes exposing only a part of the second radiation curable resin applied over the second substrate to radiation so as to leave the second radiation curable resin applied inside of the second radius of the second substrate uncured.
15. A manufacturing method for an optical data recording medium according to claim 14 , wherein the second radius is the same as or larger than the first radius.
16. A manufacturing method for an optical data recording medium according to claim 13 , wherein the second radius is 90% or more of a radius of the second substrate.
17. A manufacturing method for an optical data recording medium according to claim 2 , wherein said curing of the first part of the first radiation curable resin includes exposing only a part of the first radiation curable resin applied on the first substrate to radiation so as to leave the first radiation curable resin applied outside of the first radius of the first substrate uncured.
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June 30, 2003
March 27, 2007
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